Process for protecting a substrate with an arylsulfonamidotriazole intumescent agent

ABSTRACT

1. INTUMESCENT COMPOSITIONS OF THE INVENTION COMPRISE CERTAIN ARYLSULFONAMIDOTRIAZOLES, SUCH AS THE SULFANILAMIDOTRIAZOLES AND DERIVATIVES THEREOF. THE INSTUMESCENT AGENTS MAY BE EMPLOYED IN CONJUNCTION WITH ADDITIVES CONVENTIONALLY USED IN INTUMESCENT COMPOSITIONS. FOR USE IN PROTECTING SUBSTRATES FROM HEAT AND FIRE, THE INTUMESCENT COMPOSITIONS MAY BE APPLIED TO THE SUBSTRATES IN ANY SUITABLE MANNER, SUCH AS BY ELECTRODEPOSITON, SPRAYING ONTO AN ADHESIVE SUBSTRATE, OR APPLICATION OF A COATING COMPOSITION COMPRISING THE INTUMESCENT AGENT.

United 3,783,017 PROCESS FOR PROTECTING A SUBSTRATE WITH AN ARYLSULFONAMIDOTRIAZOLE INTUMES- CENT AGENT Shirley H. Roth, Highland Park, N.J., assignor to Cities Service Company, New York, N .Y. No Drawing. Filed Feb. 22, 1972, Ser. No. 228,383 Int. Cl. C09d 5/18; C09k 3/28 U.S. Cl. 117-136 6 Claims ABSTRACT OF DISCLOSURE Intumescent compositions of the invention comprise certain arylsulfonamidotriazoles, such as the sulfanilamidotriazoles and derivativesv thereof. The intumescent agents may be employed in conjunction with additives conventionally used in intumescent compositions. For use in protecting substrates from heat and fire, the intumescent compositions may be applied to the substrates in any suitable manner, such as by electrodeposition, spraying onto an adhesive substrate, or application of a coating composition comprising the intumescent agent.

BACKGROUND OF THE INVENTION Field of the invention This invention relates to intumescent compositions and more particularly relates to such compositions containing a one-component intumescent agent.

Description of the prior art It is known that a substrate may be protected from heat and fire by the application of an intumescent composition. Intumescent compositions of the prior art usually contain an intumescent agent having at least three components; i.e., a carbonific, a spumific, and a catalyst; and they are typically characterized by the disadvantages of high cost, low spreading rate, relatively poor efiiciency, poor water resistance, and poor weather-ability.

As disclosed in US. Pat. 3,535,130, it has already been discovered that a one-component intumescent agent has advantages over multieomponent intumescent agents. However, the intumescent agents of the patent have poor ad herence to substrates and have an undesirable degree of moisture sensitivity.

SUMMARY OF THE INVENTION An object of this invention is to provide a novel class of one-component intumescent agents.

Another object is to provide such intumescent agents having good efliciency and a low level of moisture sensitivity.

These and other objects are attained by using as intumescent agents compounds corresponding to the formula:

wherein Ar is a divalent aromatic residue, R is hydrogen, hydrocarbon, halohydrocarbon, or acyl, and R" is a triazolyl radical.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The intumescent agents of the invention may be any compounds corresponding to the above formula. However, they are preferably compounds wherein Ar is a divalent aromatic residue derived from benzene or naphthalene or an alkyl, haloalkyl, alkoxy, haloalkoxy, halo, hydroxy, carboxy, amino, amido, or nitro derivative thereof. When 3,783,017 itented Jan. 1, 1974 the aromatic ring bears organic substituents, it is usually preferred that these substituents contain 1-5 carbon atoms. When there are halo substituents, it is usually preferred that they be chloro or bromo. It is also preferred that the aromatic ring have at least one free reactive position.

As indicated above, R of the formula may be hydrogen or a hydrocarbon, halohydrocarbon, or acyl radical, e.g., an alkyl, chloroalkyl, or bromoalkyl radical containing 1-5 carbon atoms, a phenyl, chlorophenyl, or bromophenyl radical, or an aliphatic or aromatic acyl radical.

R" is frequently a triazolyl radical, but it may be substituted if desired. The substituted triazolyl radicals most commonly found in these compounds are the chloro, bromo, carboxy, hydroxy, amino, thio, sulfonamido, C -C alkyl, C -C alkoxy, phenyl, and benzo derivatives, but compounds containing other substituted triazolyl radicals are also utilizable. When R" is a substituted triazolyl radical, the nitrogen of the sulfonamide group may be attached directly to the triazole ring, or it may be attached to the ring through the substituent.

Exemplary of the intumescent agents of the invention are 1-sulfanilarnido1 ,2,3-triazole,

4-sulfanilamido-1,2,4-triazole,

3-sulfanilamido-1,2,4-triazole,

3 -sulfanilamido- 1,2, S-triazole,

2-sulfanilamido-1,3 ,4-triazole,

3 (4- amino-3-chlorob enzene sulfonamide) -1,2,4triazole,

4- (2-amino-4-bromobenzenesulfonamido)-1,2,4-triazole,

3 (4-amino-2-ethylb enzenesulfonamido -1 ,2,4-triazole,

3- 3-amino-4-chloromethylbenzenesulfonamido -1,2,4-

triazole,

3-(4-amino-Z-butoxylbenzenesulfonamido)-1,2,4-triazole,

4- (4-amino-3 -chlorom ethoxybenzene sulfonamido 1,2,3-triazole,

1- 4-amino-3 -hydroxybenzenesulfonamido)-1,2,3-

triazole,

1-(4-amino-3-carboxybenzenesulfonamido) -1,2,3-triazole,

4- 3,4-diaminobenzenesulfonamido -l ,2,4-triazole,

3- (4-amino-2-acetamidobenzenesulfonamido -1,2,4

triazole,

3- (2-amino-4-nitrobenzenesulfonamido)-1,2,5-triazole,

2- 4-methylaminobenzenesulfonamido -1,3 ,4-triazole,

3-(4-chloroethylaminobenzenesulfonamido) -1,2,4-

triazole,

3- (4-bromomethylaminobenzenesulfonamido 1,2,4-

triazole,

3- (4-pheny1aminobenzenesulfonamido) -1,2,4-triazole,

3- [4- p-chlorophenylamino benzenesulfonamido] l ,2,4-

triazole,

3- [4- (p-bromophenylamino) benzenesulfonamido] 1 ,2,4-

triazole,

3- (p-acetamidobenzenesulfonamido) -1,2,4-triazole,

3- (p-benzamidobenzenesulfonamido) -1,2,4-triazole,

5-chloro-2-sulfanilamido-1,2,4,-triazole,

3-bromo-4-sulfanilamido-1,2,4-triazole,

5 -ethylcarboxy-l-sulfanilamido- 1,2,3-triazole,

4-hydroxy-3-sulfanilamido-1,2,5-triazole,

3-sulfanilamidoamino-1,2,4-t1iazole,

S-amino-Z-sulfanilamido-1,3,4-triazole,

5-methylthio-3-sulfanilamido-1,2,4-triazole,

3,5 -disulfanilamido- 1 ,2,4-triazole,

3-methyl-5-sulfanilamido-1,2,4-triazole,

5-ethoxy-3-sulfanilamido-1, 2,4-triazole,

5-phenyl-3 -sulfanilamido-1,2,4-triazole,

7-sulfanilamidob enzotriazole,

5-sulfanilamidobenzotriazole,

the corresponding naphthalene compounds, etc. When not readily available, these compounds may be prepared by known techniques.

For use in protecting a substrate from heat and fire, the intumescent agents of the invention may be applied in any suitable manner, e.g., electrodeposition, spraying of powdered intumescent agent onto an adhesive substrate, etc. However, it is usually preferred to compound the intumescent agent with a binder, e.g., nitrocellulose, and optionally also with one or more of the other ingre dients conventionally used in intumescent compositions, e.g., stabilizers, dispersing agents, pigments, driers, biocides, anti-foamers, thickeners, protective colloids, fillers, blowing agents, etc.; disperse the composition in a suitable liquid medium, e.g., water or a solvent or solvent mixture; and apply the coating composition thus formed to the substrate to be protected. As is the case with conventional intumescent coating compositions, it is frequently convenient to apply these coating compositions in the form of a paint having a solids content of about 10-70% by weight and an intumescent agent/binder weight ratio of about 0.075-14/1 to deposit a coating having a dry thickness of about 0.001O.75 inch.

The intumescent agents of the invention are efiicient, have low moisture sensitivity, and intumesce to form foams having good volume, cell structure, and adherence to substrates, such as wood, metal, and plastics. They are also useful as flame retardants in normally flammable compositions.

The following exmple is given to illustrate the invention and is not intended as a limitation thereof.

Example I Place one gram of 3-sulfanilamido-1,2,4-triazole in an aluminum pan and flame it with a propane torch. The compound intumesces to form an excellent volume of foam having a good cell structure.

Similar results are also observed when l-sulfanilamido 1,2,3-triazole, 4-sulfanilamido-1,2,4-triazole, and the other intumescent agents mentioned in the specification are substituted for the intumescent agents of the example.

It is obvious that many variations may be made in the products and processes set forth above without departing from the spirit and scope of this invention.

What is claimed is:

1. A process for protecting a substrate from heat and fire which comprises applying thereto an intumescent composition comprising as the intumescent agent a compound corresponding to the formula:

wherein Ar is a divalent aromatic residue, R is hydrogen, hydrocarbon, halohydrocarbon, or acyl, and R" is a triazolyl radical.

2. The process of claim 1 wherein Ar is a divalent aromatic residue derived from benzene or naphthalene or an alkyl, haloalkyl, alkoxy, haloalkoxy, halo, hydroxy, carboxy, amino, amido, or nitro derivative thereof.

3. The process of claim 1 wherein R" is a triazolyl radical or an alkyl or benzo derivative thereof.

4. The process of claim 1 wherein the intumescent agent is l-sulfanilamido-1,2,3-triazole.

5. The process of claim 1 wherein the intumescent agent is 3-sulfanilamido-1,2,4-triazole.

6. The process of claim 1 wherein the intumescent agent is 4-sulfanilamido-1,2,4-triazole.

References Cited UNITED STATES PATENTS 3,535,130 10/1970 Webb 117136 X 3,663,464 5/1972 Sawko ll7l36 X 3,707,554 12/1972 Hardy 117136 X OTHER REFERENCES Northey, Sulfonamides, pp. 32, 83-85 (1948).

WILLIAM D. MARTIN, Primary Examiner H. I. GWINNELL, Primary Examiner US. Cl. X.R. 106-15 FP 

1. INTUMESCENT COMPOSITIONS OF THE INVENTION COMPRISE CERTAIN ARYLSULFONAMIDOTRIAZOLES, SUCH AS THE SULFANILAMIDOTRIAZOLES AND DERIVATIVES THEREOF. THE INSTUMESCENT AGENTS MAY BE EMPLOYED IN CONJUNCTION WITH ADDITIVES CONVENTIONALLY USED IN INTUMESCENT COMPOSITIONS. FOR USE IN PROTECTING SUBSTRATES FROM HEAT AND FIRE, THE INTUMESCENT COMPOSITIONS MAY BE APPLIED TO THE SUBSTRATES IN ANY SUITABLE MANNER, SUCH AS BY ELECTRODEPOSITON, SPRAYING ONTO AN ADHESIVE SUBSTRATE, OR APPLICATION OF A COATING COMPOSITION COMPRISING THE INTUMESCENT AGENT. 